On Wed, Sep 21, 2022 at 2:47 PM Chris Stillson <stillson@xxxxxxxxxxxx> wrote: > > From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> > > This patch adds a new config option which could enable assembler's > vector feature. > > Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> > Co-developed-by: Greentime Hu <greentime.hu@xxxxxxxxxx> > Signed-off-by: Greentime Hu <greentime.hu@xxxxxxxxxx> > --- > arch/riscv/Kconfig | 15 +++++++++++++-- > arch/riscv/Makefile | 1 + > 2 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index ed66c31e4655..e294d85bfb7d 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -432,7 +432,17 @@ config FPU > > If you don't know what to do here, say Y. > > -endmenu # "Platform type" > +config VECTOR > + bool "VECTOR support" > + depends on GCC_VERSION >= 120000 || CLANG_VERSION >= 130000 > + default n > + help > + Say N here if you want to disable all vector related procedure > + in the kernel. > + > + If you don't know what to do here, say Y. > + > +endmenu > > menu "Kernel features" > > @@ -556,6 +566,7 @@ config CMDLINE_EXTEND > cases where the provided arguments are insufficient and > you don't want to or cannot modify them. > > + > config CMDLINE_FORCE > bool "Always use the default kernel command string" > help > @@ -648,7 +659,7 @@ config XIP_PHYS_ADDR > be linked for and stored to. This address is dependent on your > own flash usage. > > -endmenu # "Boot options" > +endmenu > > config BUILTIN_DTB > bool > diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile > index 3fa8ef336822..1ec17f3d6d09 100644 > --- a/arch/riscv/Makefile > +++ b/arch/riscv/Makefile > @@ -50,6 +50,7 @@ riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima > riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima > riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd > riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c > +riscv-march-$(CONFIG_VECTOR) := $(riscv-march-y)v > > # Newer binutils versions default to ISA spec version 20191213 which moves some > # instructions from the I extension to the Zicsr and Zifencei extensions. > -- > 2.25.1 > Kernel boot hangs if compiled LLVM and vector enabled. Because LLVM enables auto vectorization by default and it inserts random vector instructions. We need to add "-mno-implicit-float" for llvm builds to disable auto vectorization. Thanks Vineet and Saleem for the hint :). -- Regards, Atish
